package test1;

public class StringDemo7 {
    public static void main(String[] args) {
        int[]arr={1,2,3};
        String str = arrToString(arr);
        System.out.println(str);

    }
    public static String arrToString(int[]arr){
        if(arr==null){
            return "";

        }
        if(arr.length==0){
            return "[]";
        }
        String result="[";
        for (int i = 0; i <arr.length ; i++) {
            if(i==arr.length-1){
                result=result+arr[i];
            }else{
                result=result+arr[i]+",";
            }
        }
        result=result+"]";
        return result;
    }
}
